I added a feature request in our internal issues/improvements tracking system and added your feedback on it, so our development team will analyze this for a possible implementation in a future version of oXygen.
As a workaround, currently you can use the universal scrolling to navigate left-right/up-down in the editor, clicking on the middle button of your mouse (usually this is the vertical scroll wheel). You could either keep the button pressed then drag (for more control over scrolling), or release the button and move the mouse in the direction you need to navigate in the editor.
Are you missing a feature? Request it's implementation here.